<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button id="connect">连接</button>
    <button id="send" disabled="true">发送数据</button><br>
    从服务端接受的数据如下 <br>
    <span id="recv"></span>
    <script>
        var connect = document.querySelector('#connect')
        var send = document.querySelector('#send')
        var recv = document.querySelector('#recv')
        let ws = null
        connect.onclick = function() {
            ws = new WebSocket('ws://localhost:9998') //配置websocket 
            ws.onopen = () => {
                console.log('连接服务器成功了')
                send.disabled = false
            }
            ws.onclose = () => {
                console.log('连接服务器失败了');
                send.disabled = true
            }
            ws.onmessage = msg => {
                console.log('接收到服务器向客户端发送的数据');
                console.log(msg);
                recv.innerHTML = msg.data
            }
        }
        send.onclick = function() {
          ws.send(JSON.stringify({
            action : 'themeChange',
            socketType : 'themeChange',
            chartName : '',
            value : 'chalk'
          }))
        }
    </script>
</body>
</html>